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The 2.8 liter Duramax four-cylinder puts out 181 horsepower and 369 pound-feet of torque. But don't expect the typical diesel sounds in the cabin. They've been engineered out, for the most part. All you get is a smooth whoosh.

The diesel four is crew cab-only, with a choice of two bed lengths and either two- or four-wheel drive. If you want the four in the Work Truck trim, you're out of luck.

The diesel four is a mid range model, slotting above the standard V6. It should come in around $40,000.

Towing is where the diesel shines. Capacity is at 7,700 pounds, while the four-wheel-drive models can handle 7,600, up from a max of 7,000 pounds for a V6 Colorado.

The interior is comfy and car-like. The 8-inch infotainment system will have CarPlay with Android Auto available in March of 2016